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. 2024 Mar 22;132(12):122701.
doi: 10.1103/PhysRevLett.132.122701.

Measurement of the ^{140}Ce(n,γ) Cross Section at n_TOF and Its Astrophysical Implications for the Chemical Evolution of the Universe

S Amaducci  1 , N Colonna  2 , L Cosentino  1 , S Cristallo  3   4 , P Finocchiaro  1 , M Krtička  5 , C Massimi  6   7 , M Mastromarco  8 , A Mazzone  2   9 , E A Maugeri  10 , A Mengoni  6   11 , I U Roederer  12   13   14 , O Straniero  3   15 , S Valenta  5 , D Vescovi  3   4 , O Aberle  8 , V Alcayne  16 , J Andrzejewski  17 , L Audouin  18 , V Babiano-Suarez  19 , M Bacak  8   20   21 , M Barbagallo  2   8 , S Bennett  22 , E Berthoumieux  21 , J Billowes  22 , D Bosnar  23 , A Brown  24 , M Busso  4   25 , M Caamaño  26 , L Caballero-Ontanaya  19 , F Calviño  27 , M Calviani  8 , D Cano-Ott  16 , A Casanovas  27 , F Cerutti  8 , E Chiaveri  8   22 , G Cortés  27 , M A Cortés-Giraldo  28 , L A Damone  2   29 , P J Davies  22 , M Diakaki  8   30 , M Dietz  31 , C Domingo-Pardo  19 , R Dressler  10 , Q Ducasse  32 , E Dupont  21 , I Durán  26 , Z Eleme  33 , B Fernández-Domínguez  26 , A Ferrari  8 , V Furman  34 , K Göbel  35 , R Garg  31 , A Gawlik-Ramięga  17 , S Gilardoni  8 , I F Gonçalves  36 , E González-Romero  16 , C Guerrero  28 , F Gunsing  21 , H Harada  37 , S Heinitz  10 , J Heyse  38 , D G Jenkins  24 , A Junghans  39 , F Käppeler  40 , Y Kadi  8 , A Kimura  37 , I Knapová  5 , M Kokkoris  30 , Y Kopatch  34 , D Kurtulgil  35 , I Ladarescu  19 , C Lederer-Woods  31 , H Leeb  20 , J Lerendegui-Marco  28 , S J Lonsdale  31 , D Macina  8 , A Manna  6   7 , T Martínez  16 , A Masi  8 , P Mastinu  41 , E Mendoza  16 , V Michalopoulou  8   30 , P M Milazzo  42 , F Mingrone  8 , J Moreno-Soto  21 , A Musumarra  43   44 , A Negret  45 , R Nolte  32 , F Ogállar  46 , A Oprea  45 , N Patronis  33 , A Pavlik  47 , J Perkowski  17 , C Petrone  45 , L Piersanti  3   4 , E Pirovano  32 , I Porras  46 , J Praena  46 , J M Quesada  28 , D Ramos-Doval  18 , T Rauscher  48   49 , R Reifarth  35 , D Rochman  10 , C Rubbia  8 , M Sabaté-Gilarte  8   28 , A Saxena  50 , P Schillebeeckx  38 , D Schumann  10 , A Sekhar  22 , A G Smith  22 , N V Sosnin  22 , P Sprung  10 , A Stamatopoulos  30 , G Tagliente  2 , J L Tain  19 , A Tarifeño-Saldivia  19 , L Tassan-Got  8   18   30 , Th Thomas  35 , P Torres-Sánchez  46 , A Tsinganis  8 , J Ulrich  10 , S Urlass  8   39 , G Vannini  6   7 , V Variale  2 , P Vaz  36 , A Ventura  6 , V Vlachoudis  8 , R Vlastou  30 , A Wallner  51 , P J Woods  31 , T Wright  22 , P Žugec  23 ; n_TOF Collaboration
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Free article

Measurement of the ^{140}Ce(n,γ) Cross Section at n_TOF and Its Astrophysical Implications for the Chemical Evolution of the Universe

S Amaducci et al. Phys Rev Lett. .
Free article

Abstract

^{140}Ce(n,γ) is a key reaction for slow neutron-capture (s-process) nucleosynthesis due to being a bottleneck in the reaction flow. For this reason, it was measured with high accuracy (uncertainty ≈5%) at the n_TOF facility, with an unprecedented combination of a high purity sample and low neutron-sensitivity detectors. The measured Maxwellian averaged cross section is up to 40% higher than previously accepted values. Stellar model calculations indicate a reduction around 20% of the s-process contribution to the Galactic cerium abundance and smaller sizeable differences for most of the heavier elements. No variations are found in the nucleosynthesis from massive stars.

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